# print("hello world")
# this is a 注释

# 这是多行注释
"""
print("hello world")
"""

# print(type('hello world'))

# print(5/2)

# str = "10"
# ret = int(str)
# print(type(ret))

# num = 10
# print(type(str(num)))
#
# f = 3.14
# print(type(int(f)), int(f))

# 运算符
# a = 1
# b = 2
# print(a + b)
# print(a - b)
# print(a / b)
# print(a // b)
# print(b ** 2)

# # 字符串拼接
# num = 100
# num = str(num)
# print("hello : " + num)

# print("hello %s" % "world")
# num = 100
# print("hello : %d" % num)


# num = 100
# str = 'hello world'
# f = 3.14
# print("%d,%s,%f" % (num, str, f))


# num = 100
# print("%5d" % num)
# f = 3.1415926
# print("%.2f" % f)

# 使用f进行占位
# number = 100
# str = 'hello world'
# ff = 3.14
# print(f"{number},{str},{ff}")

# print(f"{2 * 2}")

# str = """hello world"""
# print(str)

# print("请输入一个整数:")
# num = input()
# print(num)
#
# num = input("请输入一个整数")
# print(type(num))

# num = int(input('请输入一个整数:'))
# if num < 0:
#     print("num<0")
# elif num > 0:
#     print("num>0")
# else:
#     print("num==0")

# num = 0
# i = 1
# while i <= 100:
#     num += i
#     i+=1
# print(num)
